从PowerShell中的绝对路径获取相对路径 [英] Getting relative path from absolute path in PowerShell

问题描述

您有一条绝对路径，但您希望它相对于另一条路径.

You have an absolute path, but you want it to be relative to another path.

示例:

P:/SO/data/database.txt

--> Now we want the filename to be relative to: P:/SO/team/lists/
../../data/database.txt

我已经发现堆栈溢出 问题 如何将绝对路径转换为相对路径在PowerShell中? .

I have already found the Stack Overflow question How to convert absolute path to relative path in PowerShell?.

一个答案链接到已经开发的Cmdlet ，但是这个对我不起作用.使用Set/Get-Location的技巧要求路径存在.

One answer links to an already developed Cmdlet, but this one didn't work for me. And the trick using Set/Get-Location requires the paths to exist.

推荐答案

解决方案

我从用PHP编写的 Gordon 中找到了答案:

The solution

I found an answer from Gordon written in PHP: Getting relative path from absolute path in PHP.

这是我到PowerShell的端口:

Here is my port to PowerShell:

<# This is probably not the best code I've ever written, but
   I think it should be readable for most (advanced) users.

   I will wrap this function into a Cmdlet when I have time to do it.
   Feel free to edit this answer and improve it!
#>
function getRelativePath([string]$from, [string]$to, [string]$joinSlash='/') {

    $from = $from -replace "(\\)", "/";
    $to = $to -replace "(\\)", "/";

    $fromArr = New-Object System.Collections.ArrayList;
    $fromArr.AddRange($from.Split("/"));

    $relPath = New-Object System.Collections.ArrayList;
    $relPath.AddRange($to.Split("/"));


    $toArr = New-Object System.Collections.ArrayList;
    $toArr.AddRange($to.Split("/"));

    for ($i=0; $i -lt $fromArr.Count; $i++) {
        $dir = $fromArr[$i];

        # Find first non-matching directory
        if ($dir.Equals($toArr[$i])) {
            # ignore this directory
            $relPath.RemoveAt(0);
        }
        else {
            # Get number of remaining directories to $from
            $remaining = $fromArr.Count - $i;
            if ($remaining -gt 1) {
                # Add traversals up to first matching directory
                $padLength = ($relPath.Count + $remaining - 1);

                # Emulate array_pad() from PHP
                for (; $relPath.Count -ne ($padLength);) {
                    $relPath.Insert(0, "..");
                }
                break;
            }
            else {
                $relPath[0] = "./" + $relPath[0];
            }
        }
    }
    return $relPath -Join $joinSlash;
}

注意: -您 From 路径必须以斜线结尾！

Attention: - You From path has to end with a slash!

getRelativePath -From "P:/SO/team/lists/" -To "P:/SO/data/database.txt";
--> ../../data/database.txt

getRelativePath -From "C:/Windows/System32/" -To "C:/Users/ComFreek/Desktop/SO.txt";
--> ../../Users/ComFreek/Desktop/SO.txt

这篇关于从PowerShell中的绝对路径获取相对路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！